Microsoft SwiftKey AI Keyboard 4+

The best third party iOS keyboard. What's amazing is every feature works perfectly. I haven't seen any bugs.
☑️ Neat keyboard themes. All themes became free after Microsoft acquisition.
☑️ You can also design your own keyboard using a photo.
☑️ The new Nickel X theme is designed for iPhone X (I don't have one 😂) but it's also good on all the other iPhones. It detects the app you're using if in light or dark mode and the keyboard will automatically adapt. THE LITTLE THINGS.
☑️ Very smart. It predicts the word I'm currently typing whether in English or Filipino (JAW DROP). And it also suggests the next word I'm about to type whether I'm using English or Filipino (JAW ON THE FLOOR). Bilingual folks will definitely appreciate this.
☑️ Swipe typing is fairly accurate. It also has clipboard feature in which you can store frequently used text. Emoji is complete.
☑️ Force touch on the keyboard and you can move your cursor. This is similar to the stock iOS keyboard.
⛔️ Still defaults back to the stock iOS keyboard when typing on sensitive form fields. But I guess that's an OS restriction. 🤷🏻‍♂️

You can construct a sentence by just tapping in suggested bar, it's software/algorithm is much more better than apple's at remembering what you'll probably type next, and it also remembers your native language. In this update they've supported my language, but even then I could use this in my native language which is tagalog(filipino) and the keyboard is in english, the more you use it the more you'll probably realize you were just tapping whatever you want to say. I just wish they'd support my third language which is Japanese.

I use zoomed mode in my iPhone because I have bad eyesight. However, my hands are small. I make mistakes with this keyboard easily because the keyboard is too big on screen and I can't reach some letters properly. I liked Gboard as I can customize the size there and I can tap longer on the letters and the symbols will appear, but now it refreshes every other second and Swiftkey is the only decent keyboard that can provide me with a proper emoji and GIF search as an alternative to Gboard.